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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec25943f6a7f0994fa351a0bce2589227325d4c48b3600eeabbc81addb424764' 
  AND token = 'u8xNEUjV3PxxaCrSS7Rxe3dx9tr2XHmodDj9Eu/nWzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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