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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a000e17f388734b87bb7f18b54c57393fa5cd9395a298b37a6f6111fa8fe8fba' 
  AND token = 'JyefK3PE5/ygkw5dfYDDps2Iayblf4EkK/WHx+jJy9M=' 
  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"
    }
  }
}