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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f39eae414341363702922ca412afe0ed0cf20eedbf5c3e15f39430fb1e4db398' 
  AND token = 'luDKxxf+ZljnJ0ZW4IGp7dPORNVemIPJwnFC2uc2Ed0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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