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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ee8d4fb6fc8ca62ca7e5f85f43ea5d1dc653d7b32def76a8cc46ee3211c6eb3' 
  AND token = 'YOpjfGLdJE7sTqUf37n7s6m7XUO5Bm9XEh/SJ8mXXqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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