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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f298ca643af1928826ab1b7324a7e613d842094e7fb70a9651ea27117d808606' 
  AND token = 'brUx3PDMNoS0HqnQr9VeAUFYNRrAlpLI0pGJDp60C94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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