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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10af4bc1604ec2d4111bbf0c6f7c29b3d463ab248c7b75972a50e19fa976ad3f' 
  AND token = 'XvDblFBLx4WTqobs2dFiEor23cXN3deLwjGmdJhxXO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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