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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58d95101eeb28f7b8038fe1ec0c758569c5f8ed802d1f56948467d9154b91503' 
  AND token = 'yX5bCO0gvwAlPzMrAaUEZd/4emxZgsbOaQJz7rJkTd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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