Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0db5737b66a7b0d6b39e500f877acd436013a4407ea9de804e9a2ac793a8053' 
  AND token = '76/RSdhZcNdPbeh13JATZBkFp+pm/ArukvIvbzSkW/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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