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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f409918ee91c90f913130a83a3e8c6979a2e7a721a186d802e5e6ca2321c07' 
  AND token = '1xgHxNBC1dxgBecRom5Bdhp0UZgm4yDmXJAEKBKZc5I=' 
  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"
    }
  }
}