SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18fe9853028196adcf88d65545c8dbe5e7832300ecfe503c2094c2eb21b03207' 
  AND token = 'oGmQofHjKbWz+9/IdNXatr1Ju9uU4m6BQGQVVSvlv+c=' 
  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"
    }
  }
}