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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d8087e5aea23a6d993c5d329903da5467fc51cc031b41bb66fb20d4c7f47097' 
  AND token = 'vFOf8y4GSFcG2hWlI8s69Iac2o4vOLk0MqY6ex0j5gY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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