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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d76bfa14b669095beccaa5b546faba715efc2332edf104d99b0997e0396a036' 
  AND token = 'sUGIIr067VyEok7jwX4O9vux4MQ8EYDmsBHtUdiwc6A=' 
  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"
    }
  }
}