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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f771c7f6f94a2eb1c77d4515205d4b6ba1b142d7d3a871b9a2640b2d675a561' 
  AND token = 'UtHw7MnzI5Dr2na708t8iTs75ByRrkkJ/TSI19XvHFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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