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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '750067ff07bd1f9381dab4e8d537eefdbda82c778c19286003c5b6e28229692a' 
  AND token = 'WCeejhdzlikYIB/bwhib2BMeeXj5IiIZkFOtJP+v1Eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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