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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a21c60d5205b5c4b9539c7aa73bf2ac7eca84285eacb4eee0c67d053edf54e27' 
  AND token = '6zfT7wbv1OSkWfwIX/J6IewqQ6Z8Bewju89imYxcm+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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