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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c038633b77034de28c0e91238b7c33fb81c07414fb5c349499d05f318e36a494' 
  AND token = 'wq7cvvKtTwsRuWRocZGKrD78AlCpAC+XbS3hGt3I0qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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