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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb5e692c2ae86ea549a67e68a7705d8c43563acc78463cb4586b13d3b43c1179' 
  AND token = 'steXt78eZuCLJr/osxdRA719HJKWke8qtbdJFyby62s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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