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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38d03f66960b5ff5784faa70a05bf2094a60b84d222075feb6046c79647edce5' 
  AND token = 'zcRNh7j0bUWNoh9UA0zWVIe8NaWG11n1jB9v+OBIERA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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