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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a2f4bd2a7953c2c2b01227f5ff9262ac26fef5fb343c2ac79efee4112e1d21e' 
  AND token = 'arCLkU/K+/n6+TXPeP0iLW+4JLlFykmwuD8VM8d1iMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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