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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d55e71c4f23b90c1401b97572b48d41c03a94b47b37b6249a3f5b3059c3d4ae' 
  AND token = '5pfm40z7UFiDBw0pPYVjpAhjlTcqO2py6+w2IRVD17U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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