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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec57853acb443260299555af68acd6391803374d2f0efeefcb019f5cb57e5d77' 
  AND token = '+TkKlU+zeX0RRiiQ9BOufSbO+80HAkv2yrPo6WRM1vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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