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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e9c4eb155f4a60fde7e4cb646d01a78d89ab627f48b5c6367a37a2a7678c20d' 
  AND token = '5b4l4cH8GLeRvhIpbMKGYAqFgO89BpdZhmLCHsRg1pI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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