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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '601883f8aeb04e2e140989d7a11eb7df07135ec93f04a5bbe34c8fe30db9fdc5' 
  AND token = 'bao9NTw5PKjY9ZmVYubpMMEMLZKePVzV6dlQBL5L33Y=' 
  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"
    }
  }
}