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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc5d253a8897fe166423a486996bf1ba55e83d1e967fd2914c0837dd8fde125b' 
  AND token = 'YsNc+0Q3+ziN+ovhkXsgZZz8EZEq4kX6Om5ZeAZ+IpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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