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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93604f194bba5ee5b769b2200587b81ffa97eb814e25282e73d77d71de0a0979' 
  AND token = 'N2p1XTKEinjWukQxw42/tAs8PNsRqJLiY+Kbj48FLEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}