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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21ac80a4531fdb10c541880204d6edfec23d8b9f764858e2f1b9e9cbc75c17b1' 
  AND token = 'n2AxFVNXS3f7LO+zOVaoSrUawIN89zVbTa8zoGw+C4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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