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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43a40216af5de8d8e82e3d6928dd61697ec3efaaf217d8bf6c7b443c98117d1c' 
  AND token = 'HfMqT4IzZDzt9ZfyIJ8u278vu4MiJJ2pQe5r5WWjBY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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