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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be5488bfebc9dbd0966f3b43586b83bc15fb3562fb7b1bc1c9249d49aeeca6aa' 
  AND token = 'RzHheg6L5B6/av3So8m0gHvDLL1hMxZd6gea9vawULI=' 
  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"
    }
  }
}