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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acc19d3b446ecfd0ca08d9339aecf6876fde947b56e1e33e1be7eaebd6920bd1' 
  AND token = 'FEws5LhDPOq97Xf4Ji86ZJWoR2qabgYRZyOUxmrhJ+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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