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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47dd07303e5b1f6584d42cca6a1599566c5d5420dafd5be2c2fd77dc3ac8427f' 
  AND token = 'YSGBMxspFmrkgiQy9F7l1o9WVrYULYVZNufll/Uf9hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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