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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6900a6d152c6aec60984f089816d13a72d98f051a7f757ca88661b1ad3ca4c2c' 
  AND token = '7ddzIFTWPJM5gLoW0epyx49M5DoDDR0zh5r5T934+VU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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