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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbcea9198e8a3bd896caaa70c5e9d23e328f17ee04a84b555d4a948186e683c5' 
  AND token = 'V1YYaxsDUDPxATTx72LX3tDJGhtTnngslFUwZB+e0A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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