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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bf7bce36d7835cd47d66bb4c5b1eef5c4077d36b49093856e29e08ab29c713d' 
  AND token = 'wj8/G7Q6fDdUJQT17cWz1HVO2lK2Ys1bReA36sfiZIA=' 
  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"
    }
  }
}