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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f13221a912814128018e8af9ed8138a251ebb1cb008ea6baa919de4f73bd03f6' 
  AND token = 'm3E/sQ40f0raNAnUMjIdIqgya9v/yk5pyLK4HY4itkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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