Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8c3c9f7df07b4485c58803ef67fbd8ae5aaf3ce1945f15c818e44bef568922e' 
  AND token = '8okOmMtThq/UDbfr0bB8MCX7sODZFcSHlxZK/iIZxtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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