Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d9c7be8d3c5a69ad6fddfb3daea3574a968578adf61a1b92f88492fcfa79f77' 
  AND token = 'zBP/xzktZkrYvZ11EwD7uTf0ZBetMrYvUjeahjEmrp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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