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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80967f221af68027cb756f0deabbe9fefbb8bb71f7ad557e2a490f1fc0166a52' 
  AND token = 'VClcf07W0iZ1GEXWwlwsLbCeWXMMjX28sYGghdxyp9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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