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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '328c29e0486f63fa1c8ff6693e21c44bcc855d6a3dae530db43a314bed0d5821' 
  AND token = '8cR/nw8d2dldsKc73carnBH96ler17BONdlervTNGzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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