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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eac185e3c09f3d11ee3805b5d3119fc0556c618320e8ccf0c4f9441185270b41' 
  AND token = 'oEXCT1cHU0U2jL3Cu0/iC40KP1nWhkz2615gSLmgfME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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