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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '551b0775a8cb3758d740aca697b417452ca3fadf7299f2d883d1240b018a0fdc' 
  AND token = 'hayQDG/oi+rcb3s0XysaUpCUW7xmWmybjChVxmAvZbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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