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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0d89903534a846d0dc9cc64407b02f2b6f57fb258e3cefa1a551953444cbf6a' 
  AND token = '21fw98+QWGl6WP1UTIFE7y3pnoj8RrO1mFbNVS9jxKY=' 
  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"
    }
  }
}