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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d821b9a8bd730239d6280396262d0fc95188b5ffc923e7b3e0bb7c8d8131acc' 
  AND token = '2uHqSFH72dC7zZQI1cQOcBK1m34eZm7HgZagKlly8Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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