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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4338004f2e1b2907698d80bab1315575c7c6367291b435b9c42380495daff72' 
  AND token = 'UnnWonqEkU7fah0B6fkQQtmTF/XM0zYnAjb5OPhpFCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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