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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3fa81451e00f879b6eee38389c5ff514ca380b1f81911ca0df908901e58712b' 
  AND token = '65GoZKBO0kbdP7k/hycYzfASENg3Zwd9GiM0WJQwRSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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