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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9ace9e3f21b19617293289bc3c6bedcfce53eb21f7ccbe9009322c60e04c8f4' 
  AND token = 's5Okc01iJ2d0tcpbb6EbZAKWbQXq3H9tws2bx7XeKfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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