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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13fe85c782df69c5b20e6563421ddb448d1fe9c9c44e8b3b7f7363e8c7cbb7c0' 
  AND token = 'Bw0RfwxshdVRw77AX4PCldvuTuviN8H4fJHx8qFEHzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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