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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e143d12ae517dd2174f13f6faede862cb13d7a8db7d869a9c060c8f88ac9ca95' 
  AND token = 'EuaBIAUxk3EsHG6po6oUKrik+Wc9gya+jGkdGt4Z4x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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