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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b419e0eb778eb085e3c7c610c5541b07aa7d55b04e2b04f57ed6340d4d4bcfa' 
  AND token = 'laiZBlh+KYBkaONbQBNTVGp4IQDBRUM4lHlg2Vqo5Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00105

JSON explain

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