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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ba82831b1b799d0003727e2755120ae5ea212cb8c674ee16eccb61226f3c258' 
  AND token = 'iWPp3KaJzHDYTGQB1pMhj6s7rsOtU7UoipiPyDfihzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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