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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eac223e8c36866bdc1b89746f04dab013aac95b31f4970b18f147be87e3daf16' 
  AND token = 'XTyMiuHZ22axiodOYgJ+JQEwaGTpgEQz7blX1SW5k4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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