SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb6fb226406459bdd5f81e3704df7acd722757c2b9f3177836eca314a33a10c1' 
  AND token = 'psiiP4VhH0vzOMbqXyWaSwwZhl9IXu6aQZmHv2dJVVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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