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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67058da0fd56075e4a018c7884c838a9ffe702236aa85de0cef1a7d045926aee' 
  AND token = 'EDJA9sZ4bbc60GKN/ZRmneLGLItK7vrIEkIUQmzJchM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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