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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e581ed5224418fb824febb7fd186fb6234e2365041cc978535767be83a5817b' 
  AND token = 'IwzqQiHWx7/F5jdwozX9MnOkTUgoNf2J9TSDv4M3B6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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