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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eaa5514d3d522e44f7906e67fbb1b048ea408ef6c00c54b8707fde7263e419e' 
  AND token = 'WW36PS+WtLsx1j3LCbIl1uSIGk8ydv4ZKtLQhuqHf/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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