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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19c684f75e0c1eb889942dba10898dde7c682f0a9151ceb7810f240d8b3eb7e4' 
  AND token = 'DRClpuxmz0vuJ4DwLq0V0hy4KYsUXNUtLWykQKqAKh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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