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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a553c135f047decd176e4036f832d31a12f0427aefd10f9ad9818b8cc743b0f' 
  AND token = 'Q5gwYYaL9tHUKzrgaUIHAqjw4gtww5Md1v8gLOnaR3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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