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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '691bd3b6a254c170228e1d1b025e51b18ad4c214daedd4c7d58e8cf831ff2108' 
  AND token = 'UFW3q6Fip+vgiA4BkwuayU5LxAIj2f5u+1F1BOgsTVY=' 
  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"
    }
  }
}