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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3981e7b453e99fbb88079d987eb005a54938fab813d95f2f1f5ccb204a907c7d' 
  AND token = 'g5NPBO8LzKowtDGM6GIRxxyFpzti4lNMW4zy+Fy9yY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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