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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f04cd1fe201c7c8905c99f7d14af2f617007062c54cffa21f71a10f7163b44e' 
  AND token = '4HBMrSQER5RauecnQmNQbXlR4dAPNse9oRHYReAabBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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